Fix insight model display to match actual context used
The display was using 'insight.{key}' but send_insight uses
'insight.{key}.{output_type}', causing tier pattern mismatch.
For entities, this showed gemini-3-flash-preview instead of
the actual gemini-2.5-flash-lite being used.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>